If someone invades your neighbours' homes and kicks them out, you would be eager to collaborate and host them in your home indefinitely, yes?

Nations aren't homes, and specifically the West Bank was previously part of Transjordan, while the Gaza Strip was previously part of Egypt.

or maybe it has something to do with past events (of when they did let them in the past)? Noo, can't be.

Why should they? Palestinians have a home. Jordan consists of majority palestinians. Why should they take in Palestinians? Besides Egypt and Jordan are puppet regimes, paid for by the West. They receive billions for weapons annually. One dicatator and another monarch suppressing their people and getting weapons and intelligence in return.